noun

assumption

assumption, supposition, presumption, taking on

Your assumption is incorrect.

Your assumption is incorrect.

The assumption of power was swift.

The assumption of power was swift.

an assumption ((that...)) a belief that something is true without proof. He made the assumption that she was single.

on the assumption ((that...)) based on the belief that something is true. We are working on the assumption that it is true.

Synonyms: supposition, hypothesis, presumption; Antonyms: fact, proof

From Latin 'assumere' (to take up), formed from 'ad-' (to) + 'sumere' (to take).

Think of the verb 'to assume'. An assumption is what you have when you assume something.

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